Use oil sight glasses to see if your pump is working correctly. When lubricating oil in equipment is clean, the pump is efficient. Oil condition monitoring provides all plant personnel the insight to spot a problem. As a result, the oil sight glass can help to avoid a costly pump repair. Transparent oil sight glasses mount to the drain of the sump. It has a threaded connection and a drain valve for water removal. Visual inspection allows users to take immediate action for the presence of free water, sediment, emulsified oil or dark oil.